To be truthful, my "requirements" include first and foremost, a great looking enclosure. There is a reason for that. I want be able to buy the enclosure separately. This is important.
In my vision, there would multiple sources for boards that might fit inside. Not every user might want or need the same computing power or peripherals.
Imagine, to take an example, if there were multiple RaspberryPi-sized boards. Then you could mix and match different available enclosures[1] with different boards.
1. We are seeing the market respond with many, varied enclosures for the Pi.
There are lots of development boards for sale to consumers, and there are dedicated people porting UNIX OS's to run on them.
What I don't see, generally, are reasonably-priced and attractive enclosures for these boards. The RaspberryPi may be changing this state of affairs, as the Pi enclosure market continues to grow.
Separating out the parts of the device, from the enclosure to the PCB to the OS to the third party software is, you might say, like the UNIX userland philosophy of isolating functions to their own individual utilities. This separation allows more flexibility and more power, in the example of the UNIX userland by allowing the user to filter and redirect output and connect utilities together with pipes.
What are the things Apple does well? Enclosures and graphics, in my opinion. (And controlling their users :) UNIX is not on the list. There are better UNIX alternatives than iOS. My opinion.
Or, as in the article, you can wait and hope that iOS can be improved to be more like those UNIX alternatives.